Propeller.



Patented Apr. 22, 1913.

2 SHEETS-SHEET 1.

INVENTOR J. H. JENSEN.

PBOPELLER.

APPLIOATION FILED JUNE 25, 1912.

WITNESSES J, H. JENSEN.

PROPBLLER.

' 'APPLIOAT ION FILED JUNE 25, 1912.

Patented Apr. 22, 1913.

2 SHEETSSHEET 2.

WITNESSES INVENTOR croHN HENRY .TENsEN, or rnrcn, ARIZONA.

rnorELLnR.

Specification of Letters Patent.

Patented Apr. 22, 1913.

Application filed June 25, 1912. Serial No. 705,811.

To all whom, it may concern:

Be it known that I, JOHN H. JENSEN, a citizen of the United States,residing at Price, in the county of Final and State of Arizona, haveinvented certain new and useful Improvements in Propellers, of which thefollowing is a specification, reference be ing had therein to theaccompanying drawing.

This invention relates to propellers and has special reference to apropeller adapted for use in connection with flying machines and thedriving means thereof.

The principal object of the invention is to improve the efficiency offlying machine propellers.

With the above and other objects in view, this invention consists ingeneral of certain novel constructions, combinations and arrangements ofparts, as will be hereinafter fully described, illustrated in theaccompanying drawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and :Figure l is a plan view of a set ofpropellers and their driving shafts as constructed in accordance withthis invention. Fig. 2 is a side elevation thereof. Fig. 3 is a sectionon the line 3-8, Fig. 1. Fig. 1 is a detail view of a certain bearingused herewith. Fig. 5 is a detail view on the line 55, Fig, 1.

The propellers in this invention are supported from a certain frame ofwhich the longitudinal members are indicated at.10. Connecting theselongitudinal frame members are cross bars 11 each of which is providedwith a centrally disposed opening 12 and with yoke ends 13 which engagearound the respective cross bar. For the sake of convenience it ispreferred that these members be shaped somewhat like four-pointed starsin cross section between the yoke, there being provided verticallydisposed webs 14 on each member having centrally disposed flanges 15projecting from each side thereof. Centrally each cross member isprovided with a boss 16 through which the opening 12 passes. ,Certain ofthese members 11 are provided with ball races 17 hereinafter to bedescribed.

J ournaled in two of the openings '12 is a hollow shaft 18 on one endwhereof is mounted a belt pulley 19 while on the other end there isprovided a propeller having a boss 20 and oppositely disposed blades 21.

Journaled in a second member 11 and en tending through the hollow shaft18 is a second hollow shaft 22 provided with a belt pulley 22 of greaterdiameter than the belt pulley 19 on one end and a propeller having aboss 2st and blades 25 of a greater pitch than the blades 21 011 theother end.

Journaled in the remaining member 11 and passing through the hollowshaft 22 is a shaft 26 which is provided on one end with a belt pulley27 of greater diameter than the belt pulley 23 at one of its ends andwith a propeller having a boss 28 and blades 29 of greater pitch thanthe blades 25 at the other end. It will thus be observed that as thediameter of the belt pulley is increased in like manner does the pitchof the blade controlled thereby.

Each of the belt pulleys is provided with a ball race 30 and balls 31are held between the ball races 17 and 30 so that the thrust is taken upby anti-friction means when the propellers are revolved.

Extending laterally from one of the members 10 is a pair of framemembers 32 which are connected at their outer ends by the member 33.These members 32 serve to support a bearing 34 for a drive shaft 35which carries a drum 36. Belts '87 connect this drum with the respectivepulleys 19, 28, and 27 and it is to be noted that these belts arealternately straight and cross so that the propellers are rotatedalternately in opposite directions, the pitch of the screwbeing in orderto accommodate this, alternately right and left hand.

In the operation of the device it is to be noted that as the drum 36 isrevolved the belts will drive the various shafts in an increasing ratioof speed from the inner shaft outward so that it will be necessary tohave an increasing ratio of pitch from the for ward to the rearpropeller. It will also be noted that by this arrangement a series of.propellers may be used all of which can beplaced in the center line ofresistance of the air ship, thus eliminating the tendency of thepropellers to cause movement other than that in a straight line.Furthermore, by reason of the alternate propellers revolving in oppositedirections gyroscopic action due to their movement may be eliminated.

Having thus described the invention, what is claimed as new, is I 1. Ina device of the character described, a series of telescoping shafts, aseries of propellers each carried on a respective shaft, said propellershaving a pitch varying in ratio from Within outward, and means to drivesaid propellers simultaneously at different speeds, said means beingarranged to drive the propellers at speeds having an inverse ratio totheir pitches.

2. Propelling means for air ships and the like consisting of a series ofpropellers having alined hubs and blades, the pitch of the blades of theseveral propellers increasing throughout the series, and means to drivesaid propellers at speeds in inverse order to the pitches thereof.

3. Propelling means for air ships and the like consisting of a series ofpropellers having alined hubs and blades, the pitch of the blades of theseveral propellers increasing throughout the series, and means to drivesaid propellers at speeds in inverse order to the pitches thereof, saidmeans being arranged to drive alternate propellers in oppositedirections.

4:. A series of shafts revolubly mounted one Within another, a series ofpropellers mounted on said shafts and having blades of decreasing pitchfrom the inner shaft outward, the pitch of the blades on alternatepropellers being opposite, a series of drive pulleys carried on saidshafts at the ends opposite the blades and decreasing in diameter fromthe inner shaft outward, a drum, means to revolve said drum, andalternate straight and crossed belts extending around said drums andbelt pulleys.

In testimony whereof I hereunto afliX my signature in presence of twowitnesses.

JOHN HENRY JENSEN.

\Vitnesses J. M. HOWLETT, G. WV. FINLAY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, I). C.

